Area Formulas for Two-Dimensional Shapes
Area measures the total two-dimensional space enclosed within a shape's boundary. Below are essential mathematical formulas for standard geometric shapes.
1. Rectangle Area Formula
Area = Length × Width ( A = l · w )
Multiply the long side (length) by the short side (width).
2. Circle Area Formula
Area = π × Radius² ( A = πr² )
Where π ≈ 3.14159, and r is the distance from center to circle edge.
3. Triangle Area Formula
Area = ½ × Base × Height ( A = 0.5 · b · h )
Multiply base length by perpendicular height, then divide by 2.